78339689890 has 64 divisors (see below), whose sum is σ = 175851295488. Its totient is φ = 24411340800.

The previous prime is 78339689881. The next prime is 78339689891. The reversal of 78339689890 is 9898693387.

It is a super-2 number, since 2×78339689890² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is not an unprimeable number, because it can be changed into a prime (78339689891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3698530 + ... + 3719650.

It is an arithmetic number, because the mean of its divisors is an integer number (2747676492).

Almost surely, 2^78339689890 is an apocalyptic number.

78339689890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78339689890 is an abundant number, since it is smaller than the sum of its proper divisors (97511605598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78339689890 is a wasteful number, since it uses less digits than its factorization.

78339689890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25963.

The product of its (nonzero) digits is 141087744, while the sum is 70.

The spelling of 78339689890 in words is "seventy-eight billion, three hundred thirty-nine million, six hundred eighty-nine thousand, eight hundred ninety".